Free Printable WorksheetScienceGrade 8Science CurriculumSCI.8.09

8.09 Evidence Based Explanations (Claim Evidence Reasoning) Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.09 Evidence Based Explanations (Claim Evidence Reasoning). Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Evidence‑Based Explanations (Claim–Evidence–Reasoning) - Which statement best scientific explanations that clearly link a claim to specific evidence and reasoning grounded in accepted scientific principles? (SEP: Asking Questions/Defining Problems; Planning and Carrying Out Investigations; Developing and Using Models; Analyzing and Interpreting Data; Using Mathematics and Computational Thinking; Constructing Explanations/Designing Solutions; Engaging in Argument from Evidence; Obtaining/Evaluating/Communicating Information; CCSS RST.6–8.1–10; WHST.6–8.1–8; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 8.09 Evidence Based Explanations (Claim Evidence Reasoning) skill assessments:

Problem 1Difficulty: Mastery

An enzyme-catalyzed reaction was measured with and without an inhibitor. Without inhibitor: rate increased with substrate and leveled off at 120 units/min. With inhibitor: rate increased with substrate and leveled off at 120 units/min, but higher substrate concentration was needed to reach the same rates at low-to-medium substrate.

Which statement best explains the inhibitor type using claim-evidence-reasoning?

AThe inhibitor is noncompetitive because it changes the maximum rate, and the maximum rate stayed the same.

BThe inhibitor permanently destroys the enzyme because the rate leveled off.

CThe inhibitor type cannot be inferred from rate vs substrate data, so the graph provides no evidence.

DThe inhibitor is most consistent with competitive inhibition; evidence is the same maximum rate (120 units/min) in both conditions but reduced rate at lower substrate when inhibitor is present, and competitive inhibitors compete for the active site so adding more substrate can overcome inhibition and reach the same Vmax.

Solution & Explanation:Competitive inhibition raises the apparent substrate needed for a given rate but does not change the maximum rate if enough substrate is available. The evidence of same Vmax with a shifted curve supports competitive inhibition.

Problem 2Difficulty: Mastery

Two circuits used the same battery and identical bulbs.,,Science Circuit 1: two bulbs in series.,,Science Circuit 2: two bulbs in parallel.,,Science Measured current from the battery: Circuit 1 = 0.20 A, Circuit 2 = 0.40 A. In Circuit 2,Science

,,Science "Which statement best explains the differences using claim-evidence-reasoning?,A. Series bulbs are brighter because current is forced through both bulbs

Aso they must get more electricity.

BParallel bulbs are dimmer because electricity splits

Solution & Explanation:and in parallel branches

Problem 3Difficulty: Mastery

An unknown gas was produced in a reaction. Tests showed: - A glowing splint did NOT relight. - A lit splint was extinguished. - The gas turned limewater cloudy. The reaction occurred at room temperature.

Which statement best explains the gas identity using claim-evidence-reasoning?

AThe gas is oxygen because any gas that changes limewater must be oxygen.

BThe gas is carbon dioxide; evidence is that it extinguished a lit splint (does not support combustion) and turned limewater cloudy, and carbon dioxide reacts with limewater to form a precipitate and does not relight a glowing splint like oxygen would.

CThe gas is hydrogen because hydrogen always puts out flames.

DThe gas is nitrogen because nitrogen is the most common gas in air, so it is the best guess.

Solution & Explanation:The combination of tests is key evidence. CO2 does not support combustion (extinguishes flame) and produces cloudy limewater. The reasoning matches standard gas identification tests.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.09 (Use observations and data to support scientific explanations and claims.).